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Why can dew on low grass and frost on a very cold nearby metal surface occur on the same night?

Answer and explanation

Correct answer: Because different surfaces can have different temperatures

The correct answer is A. During the same night, nearby materials can lose and gain heat at different rates. Grass may cool enough for water vapour to condense as liquid droplets while its surface remains above freezing. A metal object may become colder, or may have a colder exposed surface, allowing the deposited moisture to freeze as frost. Thus the surrounding air can be broadly similar while the temperatures of individual surfaces differ. B is wrong because water vapour can reach and condense on metal. C is wrong because grass can also develop frost when its temperature is below freezing. D is wrong because the distinction between dew and frost depends strongly on surface temperature relative to the freezing point. Memory cue: same night does not mean same surface temperature.

Related tags

DewFrostSurface TemperatureHeat LossForms Of Condensation: DewFogAnd MistForms Of Condensation Dew Frost Fog And MistWater In The AtmosphereGeography

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